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TI preamplifier IC eyes audio apps

Posted: 26 Dec 2003 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? ti? microphone preamplifier ic? preamplifier ic? burr-brown pro audio?

Texas Instruments Inc. (TI) has introduced what it claims as the industry?s first digitally controlled microphone preamplifier IC from its Burr-Brown Pro Audio product line.

The PGA2500 is designed for use as a front-end for high-performance ADCs in a variety of professional audio applications, such as microphone preamplifiers, digital audio mixers and recorders, and broadcast and studio equipment.

It features a wide gain range of 10dB through 65dB (1dB per step), allowing the IC to be used with a variety of microphones. Gain settings and internal functions are programmed using a 16-bit control word, which is loaded using a simple serial port interface. A serial data output pin provides support for a daisy-chain connection of multiple PGA2500 devices.

With low noise, wide dynamic range and a differential signal path, the device offers higher dynamic range, lower THD+N, and lower equivalent input noise versus gain when compared to discrete designs.

An on-chip dc servo loop is employed to minimize dc offset, while a common-mode servo function may be used to enhance common-mode rejection. Four programmable digital outputs are provided for controlling the external switching of input pads, phantom power, high pass filters and polarity reversal functions. The device operates on a 5V supply.

Packaged in a 28-lead SSOP, it is priced from $9.95 in 1,000 piece quantities. An evaluation module (EVM) is also available.

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